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Liquid Crystals and their Application
Russian Journal

Zhidkie kristally i ikh prakticheskoe ispol'zovanie

Жидкие кристаллы и их практическое использование

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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2011, 3, 62—70.





Binary Liquid Crystalline Systems Composed of Poly(Propylene Imine) Dendrimer and p-n-Pentyloxy-p'-Cyanobiphenyl II. Thermodynamics of Dissolution of n-Alkanes and n-Alkanols at Infinite Dilution



S. V. Blokhina1, M. V.Ol'khovich1, A. V. Sharapova1, N. V. Usol'tseva2

Author affiliations
1Institute of Solution Chemistry, Russian Academy of Sciences
153045 Ivanovo, Akademicheskaya Str., 1. 
E-mail: svb@isc-ras.ru
2Ivanovo State University, Nanomaterials Research Institute
153025 Ivanovo, Ermak Str., 39. 
E-mail: nv_usoltseva@mail.ru

Abstract
Thermodynamics of solution of n-alkanes and n-alkanols in the binary sorbents composed of the liquid crystalline poly(propylene imine) dendrimer and nematic p-n-pentyloxy-p'-cyanobyphenyl has been studied by inverse gas chromatography. Dependences of the activity coefficients of the solutes on composition of the sorbents are revealed to exhibit the minimum. Thermodynamic solute – sorbent compatibility characterized by the activity coefficients of the solutes is dependent on the sorbent composition; namely, it is controlled by counterbalancing of the enthalpy or entropy factors. The non-additive mode of the solute – sorbent interaction is explained by arising of the microdomain nematic structure enclosed in the columnar structure of the dendrimer.

Keywords: inverse gas chromatography, liquid crystalline poly(propylene imine) dendrimer, nematic p-n-pentyloxy-p'-cyanobyphenyl, thermodynamics of solution, activity coefficient.





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